Concrete-mixer.



J. lH. STEWART I l. M. SCHNK.

CONCRETE MIXER.

APPLICATION FILED MAR. 3, IsIs.

Patented June 6, 1916.

Zhi/an tors, J'zewart dJM'che/nk, by Atarnzy.

Y' UNITED STATES PATENT oEEIcE.

JOHN E. STEWART AND JOHN' M. SCHENK, 0F WATERLOO, IOWA, ASSIGNORS TO THE cEMEN'r TILE MACHINERY COMPANY, oEWAT'EELodroWA.

CONCRETE-MIXER.

Application mea March a, 1916. serial No. 81,888.

To all whom t may concern Be it known that we, JOHN H. STEWAR and JoHN M. SCHENK, citizens of the United States of America, and residents of Waterloo, Blackhawk county, Iowa, have invented -certain new and useful Improvements .in

' are illustrated in the drawing hereto annexed, which is a front elevation of a concrete-mixer of the'type mentioned, showing the mixing-drum and a portion of the supporting-means therefor in vertical central Sectio having a common receiving and delivery opening at the top, the upper parts 1 of the drum being connected to the lower part 2,

Vthe latter being preferably formed of a single casting whilethe other parts may be formed of sheet iron. An annular bevel gear l5 is fixed around the middle part of said drum and is in mesh with a bevel pinion lmounted on a short shaft rotatably seated in the upper'end of one of the side standards 13 of the machine frame, said 'shaft also carrying a belt wheel 17 Ion its Iso outer end. The fixedlyconnected standards A13 may be mounted on skids or blocks 18,

or on any other Pdesired supporting means.

The central part of the bottom of the drum baseQ'is inverted axially and tubularly at 3 and sol as to occupy but'little space in the interior of the drum while extending thereinto approximately to the tilting axis of the drum. v v

The numeral 4 denotes a downwardly bowed rock-shaft, one end, of which is susended pivotally on the shaft which carries 51e bevel pinion 16, while the other end has a trunnion pivotally supported in a bearing in the upper partof the other standard 13, and having a vcrank handle 14 fixed'ly secured onits outwardly extending end.

The bowed part of the rock-shaft 4 'has 55 an integralcylindrical' projection 7 extend- Specification of Letters Patent.

.center instea Patented June 6,

axially withrelation-to said mixing drum. Said projection 7 extends into the hollow of the inverted part 3 of said drum, the rockshaft, its projection 7, and the upper end of the inverted bottom 3 being orificed in 4line axially to seat a pivot-shaft 5. yThe pivotshaft is connected to the rock-Shaft and to the bottom of said drum at opposite ends by means of the nuts 6 and 10 respectively. The lower wall of the upper part of the tubular extensionv 3 bears rotatably upon antifriction -balls 8. seated in a raceway between it and the upper end of the projection 7, but said balls may be omitted, if desired, in the smaller and lighter sizes of machines` ing toward/ the axis'oftheshaft and located An oil-cup 12 communicates with a longitudinal duct 11 in the projection 7 to supply said raceway bearing.

While, for purposes of convenience 1n illustration, the mixing-drum 1--2 is shown.

opening vertically, yet it is understood that y in practice, it is somewhat tilted t0 mix ef- The mixing drum shown isof a cup-shape' jection 7 Oof said shaft, that is, said pivotal( connection is located relatively to said drum and shaft approximately in line with the axis of said shaft or near enough-thereto to permit of a balanced condition of the drum when loaded and` being tilted up-or down. This balanced condition is also attained when the drum is not loaded, but the principal beneiit accruing from this method ofv mounting the drum is obtained when the drum is being tilted in a loaded condition, since much less labor and effort is needed where the su port of the drum is near the of at its base, for, inthe latter case, there is a greateramountpf leverage to be overcome, which is a serious mat,-

,tler when the machine is manually tilted.

tion 3 of thel drum being tightly l clamped between the nut 10 and the shoulder of said connection of said parts. Sincethe shaft 5 shaft, and which also seals hermetically the has a relatively long bearing within the tun bular projection 7 of the rock-shaft, friction is diminished,I and a very strong supporting means formed at that location for the drum- This adds to the stability and length of life of thedrum and its bearings.

Having described our invention, whatwe claim as new, and desire to secure by Letters Patent, is:

The combination in a concrete-mixer, of a tiltable rotatable mixing-drum formed With a central inverted cup-shaped bottom part,

andl Supporting-means projected into said cuplshaped part' axially and connected thereto for the drum to rotate thereon at its extremity approximately in line With the l5 axis of tilting of the drum, to balance the loaded drum While being tilted.

Signed at Waterloo, Iowa, this 25th day of Feb. 1916.

. JOHN H. STEWART.

JOHN M. SCHENK.

Witnesses: l

PEARL MARIE STANTON, GEO. C. KENNEDY. 

